Thread feeding stop device for yarn-forming machine



Feb. 16, 1960 M. KUHNRICH ETAL THREAD FEEDING STOP DEVICE FORYARN-FORMING MACHINE Filed Oct. 1. 1957 ATTORNEYS United States PatentTHREAD FEEDING STOP DEVICE FOR YARN-FORMING MACHINE Max Kiihnrich,Karl-Marx-Stad-t, Gerhard Lassig, Neukirchen, and Willy Schulze,Karl-Marx-Stadt, Germany, assignors to VEB SpinnnndZwirnereimaschinenbau Karl-Marx-Stadt, Karl-Marx-Stadt, GermanyApplication October 1, 1957, Serial N0. 687,532

Claims priority application Germany October 19, 1956 2 'Claims. (Cl.57-85) This invention relates to a thread control means and moreparticularly to a device for stopping the delivery of the individualstrands of thread in the event of breakage thereof in machines used toproduce multi-strand yarns.

Heretofore, inmachines' of this type it has been known to stop thedelivery of'strands of thread in the event of breakage by moving thebrokenthread laterally out of engagement withthe delivery shaft by meansof a weight or an active resiliently urged pivotal lever. This pivotallever, which is commonly designated as a removal lever, is tiltabletransversely about a joint and is arranged such that it is held in anupright position and is movable out of this position upon threadbreakage into a thread removal position when it is tilted by theslightest force. Another known device is operative such that one arm ofa lever is held by the tensioned thread and the other end of the armupon thread breakage is effective to move the thread out of engagementwith the delivery shafts. This latter arm is formed with an oblique edgewhich engages the broken thread and permits the thread to slidelaterally thereover. These prior devices all have the common drawbackthat the broken end of the thread remains hanging loosely and becomesentangled with adjoining shafts such'that it must be withdrawn from thefeeding pressure roller. Hence, the loosely hanging ends of the brokenends of the thread are lost within the machine and in order to continuethe operation of the machine the thread is tied together at pointsremote from the original broken ends which necessitates that the threadsbe manually inserted between the presser and delivery rollers of themachine.

It is an object of the present invention to provide a stop device whichovercomes these difliculties and drawbacks.

By the present invention this is accomplished by an arrangementincluding a pair of cooperating thread removal levers of which one ofthe levers is held by the tensioned thread and the other thread removallever by means of its own weight is effective to move both levers uponbreakage of the thread and thereby laterally shift the thread out of itsnormal pressure engagement with the pressure surface of the pressureroller. To this end the pressure roller is formed with a peripheralthread entrapment groove, having a conical bottom surface. A strand ofthe thread is wound around the pressure surface at least once and thethread enters into single thread eye of the thread guide twice. Also theremoval lever performing the lateral shifting of the broken thread isformed with a forked end and a thread guiding arm.

A feature of the present invention is the provision of recesses on theupper edge of the conical surface which recesses are arranged eitherinclined of parallel to the axis of the cylinder.

Further objects and features will hereinafter appear.

in the drawings:

Fig. l is partial end elevational view of a yarn winding machineembodying stop arrangement of the present invention.

2,924,931 Patented Feb. 16, 1960 Fig. 2 is a rear elevational viewshowing the elements of the stop arrangement in its operative positionwhen the thread is whole.

, Fig. 3 is similar to Fig. 2, showing the elements of the stoparrangement immediately after the thread has been broken. l

Fig; 4 is'similar to Figs. 2 and 3 but showing the elements of the stoparrangement after the thread has been laterally shifted into threadentrapment groove of the pressure roller.

Fig.5 is a view of the pressure roller.

Fig. dis a cross sectional view of Fig. 5 taken substantially along thelines A-B.

Referring now to the drawings, the strand of thread 1 originates from athread cop (not shown) or the like and is threaded through the eye ofthe thread guide 2, wound about the pressure cylinder 3 and againthreaded through the eye of the thread guide 2, then between the p issure cylinder 3 and the delivery cylinder 4 from whence .it is guidedto the yarn spindles (not shown). In the drawings the numeral 5designates the operative thread strand condition sensing position of theremoval lever and the numeral 5a its rest position (see Fig. 1). Aforked thread shifting lever 6 is operatively and movably associatedwith the removal lever 5, 5a and for the purpose of improving the threadguiding characteristics is also provided with a thread guiding limb 7.Formed on the periphery of the pressure roller is a groove 8 having aconical bottom surface which tapers upwardly into the periphery. Theupwardly drawn thread end of the severed thread is designated as 1a (seeFigs. 3 and 4). The direction of rotation of the pressure cylinder isindicated by the arrow 9 and the arrow 10 shows the direction of thethread as it travels through the stopping device of the presentinvention. Provided in the groove 8 of the pressure cylinder areelongate grooves 11.

The operation of the stopping device is as follows:

The thread 1 originates from a thread cop or the like (not shown) and isthreaded through the eye of threaded guide 2 and wound once about thepressure cylinder 3 and again threaded through the thread guide eye 2 inorder that it may be guided between the pressure and delivery rollers 3and 4 respectively. The thread therefore travels in the direction of thearrow 10. Due to the fact that during normal winding the thread 1 isunder tension the removal lever 5, 5a is held in the position shown inFigs. 1 and 2. The fork ended lever 6 which is movably coupled with thelever 5, 5a is thread held in the position shown in Figs. 1 and 2 by thetension of the thread and guides the thread 1 between the forks suchthat the thread extends beneath the pressure surface of the pressurecylinder 3. Lever 6 swings in a plane parallel to the axis of thepressure cylinders 3 and 4 about a shaft 12. Lever 6 is coupled withlever 5 by means of an extension pin 13 which engages a loop 14 on lever5. The lever 5 swings on a pin 15 secured to shaft 12. When the threadbreaks it is, of course, no longer tensioned and is unable to maintainthe removal lever in its upright position shown in Figs. 1 and 2 and itdrops to a rest position as illustrated in Figs. 4 and 5. The downwardpivotal movement of the removal lever 5, 5a also causes the lever 6 toswing in a plane parallel to the axis of pressure cylinders and normalto the lever 5, 5a to move the broken thread strand 1a into the confinesof the groove 8 wherein it is entrapped. After the thread break isrepaired as by tying the severed ends together, the removal lever 5, 5ais returned to its upright position under the influence of the tensionof the thread whereby the thread transporting means is automaticallypositioned since the forked end of the thread shift lever is effectiveto shift the thread over the conical surface 8 and beneath the pressuresurface of pressure roller,

The shifting of the thread over the edge formed by the pressure surfaceand the conical surface is facilitated by the provision of the groovesll which are inclined at lesser angle to thelongitudinal axis of thepressure "roller than the conical surface.

What we claim is: I I v v p 1.- In a multi-strand yarn-forming machinehaving an eye guide adapted to guide said yarn, a rotatable pressurecylinder spaced from said eye guide for stretching and looping said yarnto said eye guide and back to said pressure cylinder, a rotatabledelivery roller in feeding contact with said pressure cylinder attheside of said pressure cylinder where said yarn is doubledba'ck,'aring groove in said pressure cylinder larger than individualstrands of said yarn adapted to grasp and wind up yarn brought into saidgroove, a yarn shifting :nieinber movable with respect to said pressurecylinder and responsive to the tension in said yarn adapted to shiftsaid yarn between said eye and 'said pressure cylinder into 'said grooveupon release of tension in said yarn, and out'of said groove uponresumption of tension in said arn,

said yarn-shifting member including gravity movable hook means movableto an upward position by tension in said yarn, and movable to a downwardpositionby release of tension in said yarn and subjection of said bookmeans to gravitational force, said yarn-shifting means including forkmeans laterally movable with respect to said pressure cylinder inresponse to said hook means, said ring groove including a conicalsurface and a vertical surface, and a slot groove upon said conicalsurface'in said ring groove inclined to'the longitudinal axis of saidpressure roller.

2. The method of controlling the passage of yarn from a feeding eye to adelivery roller in feedingc'ontac't with a pressure cylinder whichcomprises feeding said yarn through said feeding eye and between saidpressure cylinder and said delivery roller, looping said yarn about saidpressure cylinder back to said feeding eye, doubling said, yarn overbackbetween said pressure cylinder and said delivery roller, and shiftingsaid yarn between said feeding eye, andsaid line of engagement betweensaid delivery roller and said pressure cylinder into a groove in'fsaidpressure cylinder upon relaxation of tension in j Lidyarn, andshifting said doubled-over yarn back out or said groove upon resumptionof tension in said yarn.

References Cited in the file of this patent UNITED STATES PATENTS Rho'ad'es -4 Nov. 30, 1909 Hartley Apr. 30, 1929

